2 years ago

PLEASE HELPP i know the answer is 12 but how?

Mathematics

1 answer:

zheka24 [161]2 years ago

4 0

A^2+b^2=c^2

a^2+9^2=15^2

a^2+81=225
-81 -81

a^2= 144 (square root both sides)
a=12

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